.TH "TESTING/LIN/xlaenv.f" 3 "Version 3.12.0" "LAPACK" \" -*- nroff -*-
.ad l
.nh
.SH NAME
TESTING/LIN/xlaenv.f
.SH SYNOPSIS
.br
.PP
.SS "Functions/Subroutines"

.in +1c
.ti -1c
.RI "subroutine \fBxlaenv\fP (ispec, nvalue)"
.br
.RI "\fBXLAENV\fP "
.in -1c
.SH "Function/Subroutine Documentation"
.PP 
.SS "subroutine xlaenv (integer ispec, integer nvalue)"

.PP
\fBXLAENV\fP 
.PP
\fBPurpose:\fP
.RS 4

.PP
.nf
 XLAENV sets certain machine- and problem-dependent quantities
 which will later be retrieved by ILAENV\&.
.fi
.PP
 
.RE
.PP
\fBParameters\fP
.RS 4
\fIISPEC\fP 
.PP
.nf
          ISPEC is INTEGER
          Specifies the parameter to be set in the COMMON array IPARMS\&.
          = 1: the optimal blocksize; if this value is 1, an unblocked
               algorithm will give the best performance\&.
          = 2: the minimum block size for which the block routine
               should be used; if the usable block size is less than
               this value, an unblocked routine should be used\&.
          = 3: the crossover point (in a block routine, for N less
               than this value, an unblocked routine should be used)
          = 4: the number of shifts, used in the nonsymmetric
               eigenvalue routines
          = 5: the minimum column dimension for blocking to be used;
               rectangular blocks must have dimension at least k by m,
               where k is given by ILAENV(2,\&.\&.\&.) and m by ILAENV(5,\&.\&.\&.)
          = 6: the crossover point for the SVD (when reducing an m by n
               matrix to bidiagonal form, if max(m,n)/min(m,n) exceeds
               this value, a QR factorization is used first to reduce
               the matrix to a triangular form)
          = 7: the number of processors
          = 8: another crossover point, for the multishift QR and QZ
               methods for nonsymmetric eigenvalue problems\&.
          = 9: maximum size of the subproblems at the bottom of the
               computation tree in the divide-and-conquer algorithm
               (used by xGELSD and xGESDD)
          =10: ieee NaN arithmetic can be trusted not to trap
          =11: infinity arithmetic can be trusted not to trap
.fi
.PP
.br
\fINVALUE\fP 
.PP
.nf
          NVALUE is INTEGER
          The value of the parameter specified by ISPEC\&.
.fi
.PP
 
.RE
.PP
\fBAuthor\fP
.RS 4
Univ\&. of Tennessee 
.PP
Univ\&. of California Berkeley 
.PP
Univ\&. of Colorado Denver 
.PP
NAG Ltd\&. 
.RE
.PP

.PP
Definition at line \fB77\fP of file \fBxlaenv\&.f\fP\&.
.SH "Author"
.PP 
Generated automatically by Doxygen for LAPACK from the source code\&.